From the Super Mario Wiki
Baboon Balloon (Baboonus Balloonus) is Lanky Kong's special pad ability in Donkey Kong 64. Lanky learns this ability after buying the potion from Cranky Kong at his lab in Frantic Factory for seven Banana Bunch Coins. While Lanky Kong stands on a pad with his face on it, pressing the button causes Lanky to inflate himself like a balloon. Shortly after, Lanky slowly begins to float upwards. After a while, the effect wears off and Lanky Kong returns to normal, falling down in the process. During Lanky's flight, the player can move him with the control stick, although Lanky bounces off surfaces in this form. The player can press the button while Lanky is floating to end the effect prematurely.
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